There are no Christian Temples. Christians are the Temple of God. Nor are temples mentioned in the passage you quote. Nor do you understand the passage you quoted if you believe the Bible teaches Christians to pretend to be baptized for the dead. [AMPU]
ALL: The Mormon church owns the Deseret Book Co. In 1977, it printed a book entitled: A Topical Guide to the Scriptures of the Church of Jesus Christ of Latter day Saints...why it wouldn't surprise me if Teppe referenced it as a young missionary lad on the mission field.
I look at the entry for "temple" found on pp. 451-452. Per this source, the Helaman and Alma references are to "unholy temples."
That leaves only three Book of Mormon books that references "temple"...2 Nephi 5:16, Jacob 1:17; 2:2; and 3 Nephi 11:1; 24:1...the last one is about the Lord coming to his temple...The first one is about a temple being built...3 Nephi 11:1 is about being around a temple...which leaves only the book of Jacob telling anybody what was done in a temple...Jacob 1:17 says teaching was going on there...and the word of God was declared in the temple in Jacob 2:2...
That is the full extent of Book of Mormon teachings on the temple!
If Mormonism is some "restoration" of what they were doing in BoM times, then where did all of this ritualism come from???
Then he may have been taught by THIS fellow!!
And he SURELY obeyed these easy instructions; too!